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T. B. COMINSfJr.

Car Brak. No. 68,700. Patented Sept. 10, 1867 MPETERS, PIOTO-LITMOGRAPIIER. WASNINUTGM D. C:

THOMAS B. coMINs, JR, OF LOWELL, MASSACHUSETTS. Letterslateizt No. 68,700, dated September 10, 1867.

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TO ALL WHOM 1T MAY CONCERN: Be it known that I, THOMAS B. COMINS, Jr.,'of Lowell, Middlcsex county, Massachusetts, have invented new and improred RailroaCLGar Brake; and I do hereby declare that the following is a. full, clear, and exact description thereof, which will enable others skilled in the art to makeand use the some, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 represents an inverted plan View of my invention. Figure 2 is a side elevation of the same. Figure 3 is a detail side-view of one wheel and operating-cam.

Similar letters of reference indicate corresponding parts.

This invention relates to certain improvements on the railroad-car brake forwhich I inade application for.

Letters Patent on or about the 20th day of Eebruary,'1867.

The improvements consist in attaching the cam directly to the end of the shoe-bar, and not to the lower end of the shoe, as described in my aforesaid application. The shoe is done away with, and the cam only applied as a brake, which it'has been found operates better than the shoe alone, and as good as the shoe and cam combined. The eccentric is weighted so as to swing clear of the wheel when not applied.

A is the car platform. B B are the wheels, which are rnounted on axlesG, which have their hearings in boxes D, in the ordinary manner; E E are the shoe-bars, which are suspended from springs, 7L]; and on one of which a'vertiealtor nearly so)lever, a, is secured, to .the lower end of which a rod, 6, isfsecured', by which the two shoe-hairs are connected, while to theupper end of the lever a the end of a chain or cord, 0, is attached, which is wound around a revolving upright shaft, d, as is clearly shown in the drawings, and as fully described in pay aforesaid application. The-free end of'the rod 17 connects with a bolt, e, which passes through the shoebar E, between which and the head of the 'bolt a spring, F, is arranged, as shown, and as alsodeseribed in the aforesaid application. To the ends of the one or of both the shoe-bars are pivoted, by means of pinsff, eccentric earns G G, which are weighted so as to swing clear of the wheels whenever the chain c is slackened, as

shown in fig. 2. But when the brake is to he applied the calms are pressed against the periphery of the wheel,

and then, as the wheel turns,'the cam is carried around until a stop, 9, prevents it from being turned any further (see fig. 3.) That portion of 'the cam which is most distant from the pivot f is then applied to the wheel. By this arrangement the brake is gradually applied to the wheels, and not as suddenly as usual. The cams G. are made symmetrical, so that they will work with equal efl'ect'when the car moves in eitherdirection. The

regulating-spring F can be attachedto a stationary projection from the car platformor fraine, and will operate tially as and for the purpose herein shown and described.

as well as long as' it is connected with the brake-rod in themanner shown. These eccentric cams can be applied to one or more wheels of one car.

What I claim as new, and desire to secure by Letters Patent, is-

1, The eccentrics G, attached to' the ends of the shoe-bars, substantially in the manner and for the purpose herein shown and described, the said eccentrics being free to turn on their pivots,'aiid \"reighted, substantially as and for the purpose herein shownand described. V v n V V v i 2. The spring F, in combination with the shoe-bars E E and eccentrics G, all made and operating substanrnos. B. COMINS, JR.

Witnesses:

vWM. F. MONAMARA, ALEX. F. Ronnn'rs. 

